🔍 Key Concepts

• Flow path of compressor discharge air through the diffuser and into the combustor • How the cowl, inner skirt, and outer skirt shape and slow the air before it reaches the fuel nozzles • Relationship between airflow, combustion quality, and temperature distribution at the turbine inlet

💭 Think About

• Looking at the illustration, what is the first thing the diffuser cowl does to the high‑velocity compressor air as it enters the combustor area? • If the air were not guided and distributed by the cowl and skirts, what problems might occur with combustion and turbine blade life? • Which of the listed outcomes (temperature, combustion, airflow) is the direct function of the cowl/diffuser geometry, and which are natural results of that primary function?

✅ Before You Answer

• Verify in your notes how a diffuser in any gas turbine changes air velocity and pressure before combustion. • Check how the dome, inner skirt, and outer skirt holes/slots are arranged to send air around and through the flame zone. • Confirm which option best represents the primary purpose of the cowl/diffuser assembly, rather than secondary side‑effects.